Internal combustion engine



March 21, 1944. w, C NR T 4 2,344,496

INTERNAL COMBUSTION ENGINE Filed Aug. 26, 1945 2 Sheets-Sheet 1 Q I I I /p 4. lnventm Wa /liar Con/rad? I March ,21, 1944. w. CQNRADT 5 INTERNAL COMBUSTION ENGINE Filed Aug 26, 1945 2 Sheets-Sheet 2 Inventor Wa/ZZer- Con/m4? By mg,

Patented Mar. 21, 1944 UNITED STATES PATENT OFFICE INTERNAL COMBUSTION ENGINE Walter Conradt, Kenosha, Wis.

Application August 26, 1943, Serial No. 500,111

4 Claims.

This invention relates to new and useful improvements in internal combustion engines and more particularly to an engine of the double piston type.

The principal object of the present invention is to provide an internal combustion engine employing a piston assembly which is made up of a pair of coacting pistons, one of which is employed for quick compression and scavenging only.

Other objects and advantages of the invention will become apparent to the reader of the following description.

In the drawings Figure 1 is a side elevational view of the engine.

Figure 2 is a top plan view.

Figure 3 is a section on the line 33 of Figure 2.

Figure 4 is a transverse vertical section on the line 4-4 of Figure 3.

Figure 5 is a perspective view of the power piston.

Referring to the drawings wherein like numerals designate like parts, it can be seen that the engine includes a case 5 made up of a pair of side walls 6, 6 having inwardly disposed portions 1, 8 at their upper portion which meet as shown in Figure 2. These portions of the walls 6 are bolted together as at 9 and suitable packing means may be provided between the same.

The portions 8 of the walls 6, 6 are suitably formed to accommodate an exhaust valve Ill and an intake valve ll. Between these valves Ill, ll an igniting plug or spark plug I2 is p ovided.

The inner sides of the portions 8 are straight, while the inner surfaces of the portions 1 are arcuate as denoted by numeral l3 to conform with the curvature of the curved edge portion of an oscillating piston [4 which is supported by trunnions disposed into the side walls 6, 6.

As clearly shown in Figure 4, the oscillating piston l4 has a transverse channel 16 extending entirely across the piston and in this operates a much narrower piston ll which has a beveled forward end l8 which is substantially arallel to the inner side of the portions 8.

The remaining end of the piston I! is connected as at I9 to a crank 20 on a crankshaft 2i and which may be provided with a flywheel 22. An intake pipe 23 extends to the valve ll while an exhaust pipe 24 extends from the valve It].

It can now be seen, that assuming that there is a compressed charge in the chamber A, the spark plug l2 ignites this compressed charge and a piston I1 is driven to the right in Figure 3. Not

until the crank 20 has made a substantial movement does the oscillating piston l4 begin to move and this at substantially the end of the power stroke. It is to be understood, of course, that this piston I4 acts in response to the action of the piston l1, merely following the movement of the piston ll. When the piston l! is at the lowest crank position, the piston l4 will be in open position and on the return stroke of the piston ll the oscillating piston M will operate to scavenge the chamber of burned gases.

The suction stroke takes place just as the explosion stroke, the piston ll moving to the right, as shown in Figure 3, drawing in fuel through the intake valve H, as the piston l4 rocks slightly to amplify the space into which fuel can be taken. ihen on the return stroke of the piston ll both the piston l4 and the piston ll coact to compress the fuel and eventually into the small combustion chamber A.

While the foregoing specification sets forth the invention in specific terms, it is to be understood that numerous changes in the shape, size and materials may be resorted to without departing from the spirit and scope of the invention as claimed hereinafter.

Having described the invention, what is claimed as new is:

1. An engine of the character described comprising a case, a spark plug in the case, exhaust and intake valves in the case, an oscillating piston having a transverse groove, an elongated piston operative in the groove, a driven shaft including a crank to which the elongated piston is connected, one end of the groove serving as a combustion chamber and opposed to Which the spark plug is located.

2. An engine of the character described comprising a case, a spark plug in the case, exhaust and intake valves in the case, an oscillating piston having a transverse groove, an elongated piston operative in the groove, a driven shaft including a crank to which the elongated piston is connected, one end of the groove serving as a combustion chamber and opposed to which the spark is located, said oscillating piston being adapted to follow the movements of the elongated piston.

3. An engine of the character described comprising a case, a spark plug in the case, exhaust and intake valves in the case, an oscillating piston having a transverse groove, an elongated piston operative in the groove, a driven shaft includin a crank to which the elongated piston is conoperative in the groove, a driven shaft includin a crank to which the elongated piston is con-' nected, one end of the groove serving as a combustion chamber and opposed to which the spark plug is located, said elongated piston and oscillating piston being adapted to coact in scavenging and compressing.

WALTER CONRADT. 

